Research on arithmetic reconstruction tomography method based on quadric finite element

Classical arithmetic reconstruction tomography(ART) method supposes that any points in same small element have same tomography value, this assumption definitely decrease analysis resolution, To overcome the disadvantage, this paper presents a new ART method based on quadric finite element which computes value of point in element by interpolation value of element nodes In the same time, it also induced formula in detail which depicts relation of integral value along scanning line and node value, computing process such as sub stiffness matrix computation, whole stiffness matrix computation and right vector of equation computation are also discussed, in the end, an emulating reconstruction is processed by this method, the result testified that this method is reliable.